U.S.C. Title 3 - THE PRESIDENT

3 U.S.C.
United States Code, 2011 Edition
Title 3 - THE PRESIDENT
CHAPTER 1 - PRESIDENTIAL ELECTIONS AND VACANCIES
Sec. 4 - Vacancies in electoral college
From the U.S. Government Publishing Office, www.gpo.gov

§4. Vacancies in electoral college

Each State may, by law, provide for the filling of any vacancies which may occur in its college of electors when such college meets to give its electoral vote.

(June 25, 1948, ch. 644, 62 Stat. 673.)